SCREENING
Blood-based circulating tumor DNA shows promise for early colorectal cancer detection — Digestive Diseases
A systematic review and meta-analysis evaluated the accuracy of blood-based circulating tumor DNA (ctDNA) tests for detecting colorectal cancer in people without symptoms. These tests look for tiny fragments of tumor DNA that circulate in the bloodstream. The analysis included prospective and cross-sectional studies comparing ctDNA assays (which detect mutations, methylation patterns, or DNA fragments) against standard diagnostic methods. Results suggest these non-invasive blood tests could complement existing screening approaches.
What this means
Blood-based screening tests may eventually offer a convenient alternative to stool tests or colonoscopy, though they're not yet widely available or FDA-approved for routine screening. If you're avoiding colonoscopy, talk to your doctor about currently approved screening options while these blood tests continue development.